In the interview featured below, Dr. Alexander Wunsch, a physician, researcher and one of the leading experts in photobiology, explains the modern significance of photobiology. In this article we will also look at the historical development of photobiology, to help you get a better appreciation of its incredible healing potential.

I recently interviewed Dr. Wunsch about the dangers of light-emitting diode (LED) lighting. That interview has been viewed nearly three-quarters of a million times at this point. If you haven’t seen it already, please take a look, as that interview went into some very practical, real world aspects of photobiology.

Historical Use of Light Therapy

Light has been used therapeutically for thousands of years. In ancient Egypt, we know that sunlight was used for hygienic purposes, and once humans began manufacturing glass, it also became possible to produce colored light using colored glass as filter technology.

Humans have not only evolved to adapt to sunlight but also to the influence of fire — near-infrared and mid-infrared radiation that is very low in in the blue range wavelength, which is also emitted by incandescent light sources. An important point that needs to be understood is that the human retina is not designed to be exposed to blue light at night. As humans evolved, we were ever only exposed to fire light at night. This is why it’s so crucial to block blue light, particularly at night, but also during the daytime when the light is emitted from artificial sources. Incandescent and halogen lights are acceptable as they produce near-infrared wavelengths, however LEDs are best avoided, since they’re virtually devoid of these healing near-infrared wavelengths, primarily emitting blue light — the effects of which we will explore here.

Around the turn of the 18th century, light began to be used therapeutically to treat illness.

“I call the time before the 18th century the ‘mystical phase’ of light use, because humans already had clear indications that light does them good, but they didn’t explore it in a scientific manner,” Wunsch says.

“In the 18th century — we also call it ‘the age of enlightenment’ — people became much more interested in the reasons why the occurrences happen around them.”

The First Phototherapeutic Device

Andreas Gärtner, known as the “Saxonian Archimedes,” built the first phototherapeutical device. It was a foldable hollow mirror made from wood and plaster, covered with gold leaf. Using this, he could concentrate sunlight onto aching joints of patients. People suffering from arthritis, rheumatism and gout found pain relief from this phototherapeutical unit.

Today, we can explain how this device worked without causing a phototoxic reaction or burns. The gold leaf actually absorbs all of the ultraviolet (UV) radiation from sunlight, emitting luminous heat rays in the near-infrared and red wavelengths, which is beneficial because it can penetrate deeply into the tissue.

“It’s interesting that UV behaves quite peculiar in combination with certain metals. For example, silver only reflects about 4 percent of the incident UV radiation. Gold almost absorbs all the parts. The best reflector for UV is aluminum.

When we talk about phototherapy, besides the heliotherapeutic application, we always have to look at the light source, and we have to look at the beam shaping media, such as the reflector or lenses, because they all contribute to the final blend of wavelengths, which then come into action in the phototherapeutical intervention,” Wunsch explains.

The Science of Light in the 19th Century

In the late 19th century, we started gaining a great deal of knowledge about how light acts on the human body. It started with the experiments of A. Downes and T.P. Blunt, who discovered that UV radiation kills bacteria. Researchers were also interested in other parts in the optical spectrum.

He grew grapes for wine, using not only transparent colorless glass, but also blue window glass. With the latter, he got a significant increase in plant growth. Later, he performed similar experiments on humans.

“People in the late 19th century, especially in the United States, would walk around with blue glasses. In a way, they did exactly the opposite of what we do today to protect our eyesight… They even enhanced the blue part of the spectrum because they used it as a kind of booster, a kind of doping, and didn’t care about the long-term effects, which are pretty negative …”

Wearing blue-colored glasses increases the blue exposure and limits the red and infrared. The problem with that is that while short-term use of blue-enriched light has an activating effect, you can quickly develop a tolerance and, long-term, the stimulating effect is harmful to your biology. Hence, wearing blue-tinted glasses on a daily basis is not a good idea.

“You can use them for a few minutes. This can be a good idea. From today’s scientific viewpoint, we need at least one hour of unfiltered daylight [each day] during adolescence in order to prevent myopia. But it’s not pure blue, and not pure blocking. Somewhere in between is the golden pathway to health.”

The same year General Pleasonton published his book on blue light experiments, Dr. Seth Pancoast published “Blue and Red Light: Light and Its Rays as Medicine,” covering both blue and red light experiments. Pancoast understood the antagonistic effect of red and blue light, using red light to stimulate sympathetic activity and blue light to stimulate parasympathetic activity.

A year later, in 1878, a year before Edison invented the incandescent lamp, Dr. Edwin Dwight Babbitt published “Principles of Light and Color.” He used the full set of rainbow colors discovered by Newton, and later on used the color set of Goethe. The book is about 800 pages long, but for those with an interest in photobiology, it’s a treasure trove.

“Today in medicine, we start to reinvent what they already knew or what they already found out in the late 19th century — that the colors have specific effects on our health, on our organism. Using the correct colors means you can communicate with all your different organs in your system,” Wunsch explains.

According to Dr. Wunsch, Dr. Babbitt’s tome covers everything we’re currently rediscovering about photobiology and phototherapy. Babbitt even presented information about how atoms are frequency and oscillation.

With regards to the use of colored light, Babbitt used a kind of bottle shaped as a lens. By adding a salt solution, he produced different colors. He then focused colored light on different parts of the human body. Like Pleasonton and Pancoast before him, Babbitt produced therapeutic results using colored light. Wunsch explains:

“The problem was that it’s very difficult to reproduce these effects, starting with the problem that the sun doesn’t always shine… They were pioneers in chromotherapy in a time where electrical lighting was not available… People, in a way, had better circadian rhythm without electrical lighting. But in terms of scientific precision with regard to producing colored light, they had worse conditions than we have. Today, we can exactly produce the same colors anytime, during the day and during the year.”

In 1897, Dinshah Ghadiali, an India native who lived out the second half of his life in the United States, rescued the life of a patient using Babbitt’s instructions. The patient had colitis, an inflammatory disease of the intestines. Dinshah knew, from reading “Principles of Light and Color,” that indigo colored light could stop vomiting and break the disease process. This started a new chapter in chromotherapy, and Dinshah experimented with colored light for more than 23 years before he presented his system to the public.

Another chromotherapy pioneer during the late 19th century was Niels Ryberg Finsen in Denmark. He was the first to make a discrimination between negative phototherapy and a positive phototherapy. He used a very specific red light to treat small pox patients. He removed the short wavelength part of the spectrum, especially the ultraviolet, violet, indigo and blue, leaving the colors located in the longer wavelength of the light spectrum.

“You can be 100 percent sure that if you paint a room completely in red and you’re using red curtains and red tissue or cloth, that you would have 100 percent elimination of blue. The short wavelength part, the blue and the indigo, was the reason for the inflammatory reaction in patients with small pox,” Wunsch explains.

“Finsen … reinvented the negative phototherapy, which means you eliminate certain parts of the spectrum, which would exaggerate the development of a disease … This observation — that the short wavelength in the spectrum would amplify the inflammatory reaction in small pox — led him to the idea that light acts as an incitement. It is able to produce the inflammatory reaction. In small pox, this would be a problem. But he was thinking about the treatment of tuberculosis.

In treating tuberculosis, his idea was if he could produce the inflammation in the tissue, then the body would be able to cure itself. This is what he finally developed: the positive phototherapy, which means he produced exactly this part in the spectrum he formerly wanted to exclude. Using the short wavelength part enabled him to very successfully treat tuberculosis, especially in the skin … His idea was to use electric light …

In the late years of the 1890s, he established the Finsen Institute in Copenhagen and successfully treated patients with tuberculosis from all over the world. He was awarded the Nobel Prize for Physiology in 1903. This was one of the most important persons in the end of the 19th and the beginning of the 20th century.”

Phototherapy Becomes State of the Art Medicine

Finsen’s work fueled the progress of phototherapy for the next several decades. From 1900 to 1950, phototherapy was a state of the art therapeutic intervention in medicine. Remember, Finsen effectively treated tuberculosis nearly 50 years before the advent of pharmacological medication. There really was no treatment for tuberculosis prior to light therapy. Tuberculosis is a very slow-growing organism that is hard to treat. Today, patients are typically given multiple drugs to treat it.

The reason light works for tuberculosis is because UV light is germicidal. This is one of the reasons why it’s useful to hang your clothes to dry outside. Exposing your laundry to sunlight kills bacteria, viruses and other microbes that might contaminate your bed linens and clothing.

The easiest way to benefit physically from the light therapy provided by the sun is to expose your bare skin to the sun on a regular basis, ideally daily. Most people rarely ever expose more than their face and hands to the sun. Indeed, one of the most important points I want to make here is that a lack of exposure to sunlight can have some really serious adverse consequences for your health.

In the late 19th century, Dr. John Harvey Kellogg invented a phototherapeutic method using red and the near-infrared rays (the luminous heat rays). He founded the Battle Creek Sanitarium, where he performed heliotherapy on patients as early as 1876. In 1891, shortly after the invention of the incandescent lamp, he filed a patent for an incandescent light bath. In the following two years, he treated thousands of patients with this light.

Kellogg exhibited his incandescent light bath system at the world exhibition in Chicago in 1893, where it caught the attention of German chemist Dr. Willibald Gebhardt. Gebhardt visited Kellogg at the Battle Creek Sanitarium, where he learned all about its use, and then brought the technology and knowledge back to Berlin. Over the next few years, Gebhardt established hundreds of light institutes throughout Germany, treating psoriasis and pain associated with gout and rheumatism. These institutes were so successful they even posed a threat to the medical community, as doctors could not provide better relief than what people were getting from self-treatment at these light institutes.

Light Therapeutics

In 1910, Kellogg published a text book called “Light Therapeutics.” It’s a seminal work that has stood the test of time, being as valuable and revolutionary today as it was back then, if not more so, considering all the knowledge we’ve lost to modern science, and are just now rediscovering. You can download the book for free at the link above. It is a great read to see what he was doing more than a century ago.

“I really would recommend this [book] to everyone who is interested in phototherapy, because this is the basic knowledge. Everything you have to know about sunlight, ultraviolet light, visible light, the near infrared, about the use of cold, the use of heat — it’s all contained in this book from John Harvey Kellogg,” Wunsch says.

“It’s still, in my understanding, the first book to read if you want to understand how light in the different parts of the spectrum interact with the organism. It’s very systematically structured … For example, everyone warns you about sunburn, but in the pre-antibiotic era, the medical doctors sometimes had to completely change the direction in a patient … Here, sunlight was one of the therapeutic options.

I would not recommend to use this today, but Kellogg describes in detail the four different stages of a sunburn. The first thing that he says is ‘Sunburn is not a burn injury. A burn injury appears immediately. And a sunburn appears with delayed time of several hours.’

He didn’t know anything about reactive oxygen species these days, but he exactly explained that there is definitely a huge difference between an immediate heat-induced burn and a kind of phototoxic reaction that you find in a sunburn.

He discriminated or described four different stages of a sunburn from one to four. Four is with blisters. One is just the mild erythema. In those days, without antibiotics, sometimes [they] deliberately chose to induce a second degree or third degree erythema in order to change the direction of the development of the health of a certain patient.”

Heliotherapy During Surgery

Dr. Oscar Bernhard, a Swiss surgeon, even used heliotherapy (i.e. sun therapy) during surgery. Bernhard was actually using sunlight even before Finsen inaugurated and popularized his method. At this time in the late 19th century, it had become apparent that as people moved from the country to the cities, rates of rickets and tuberculosis rose, and that a lack of sunlight clearly had something to do with it, eliciting more extensive exploration of light therapy. Further, Bernhard, who lived and worked in the Swiss mountains near Davos, would place his surgical patients in direct sunlight for 10 to 15 minutes, just before closing the wound. He found this significantly improved wound healing after surgery.

Another Swiss “sun doctor” was Dr. Auguste Rollier, who began treating patients using sunlight in 1905. In the 1930s and ’40s, he ran up to 40 different hospitals in Switzerland.

“Rollier only used heliotherapy,” Wunsch says. “He was convinced that artificial light cannot do the job, and that sunlight is superior. Rollier was the master of heliotherapy in these days up to the 1950s … He was treating patients [with heliotherapy for] more than 50 years, from the beginning to the mid of the 20th century …

He was a holistic physician who not only used sunlight in a very skillful manner, but also all the other options, using music and a kind of physiotherapy or work therapy. He invented a lot of different appliances, which enabled the patient to lie in their bed and do some work and be productive …

This was very important for people suffering from tuberculosis being treated in Switzerland, because it was quite expensive to stay there as a patient … He had very good results — much better compared to what we expect from tuberculosis treatment using the five-phase antibiotics treatment we have nowadays.”

This isn’t so surprising when you consider that UV light is directly germicidal to many microbes, and UVB exposure specifically helps your body produce vitamin D. In fact, vitamin D is a biological marker for UVB radiation exposure. When your body has enough, your vitamin D levels go up.

Why Vitamin D Supplements Cannot Fully Replace Sun Exposure

Today, many simply resort to taking a vitamin D supplement, but it’s naïve to believe you’re going to get the same benefits from a synthetic oral supplement as you would from natural UVB exposure. Your body is designed to produce vitamin D in response to sunlight, not through oral intake. I’m not saying you should avoid vitamin D supplements. If you cannot get enough sunlight, that’s your next best option. But the goal should not be to raise and maintain your vitamin D levels only through swallowing a pill. As Wunsch explains:

“[I]f you administer vitamin D orally, it signals your system that you have lots of UV around you. This might even start processes that are not adequate because your skin didn’t actually have the exposure. I think the best idea, if you have the skin type so that you can stand sun exposure, is that you use this natural pathway [i.e. sun exposure]. Because then you have coordinated, coherent action pathways, which are not granted [otherwise].

Another aspect that is still unclear is if orally administered vitamin D really reaches the skin layers where you normally need it as well, in the keratinocyte layer. Cathelicidin is a substance produced under the influence of vitamin D in the skin, which helps the organism to fight germs. This might be one of the reasons why the heliotherapy and the UV therapy were so efficient with regard to tuberculosis treatment.”

Candles — A Healthy Light Alternative

Candles are even better light sources than incandescent bulbs; there is no electricity involved, and candles are the lights our ancestors have used for many millennia, so our bodies are already adapted to the light they produce. The only problem is that you need to be careful about using just any old candle, as most commercially produced candles produce poisonous emissions when burned.

As you may or may not know, many candles available today are riddled with toxins, especially paraffin candles. Paraffin is a petroleum by-product created when crude oil is refined into gasoline, and a number of known carcinogens and toxins are also added to the paraffin to increase burn stability. There is also the potential that lead has been added to the wicks of your candles, and soot can invade your lungs.

To complicate matters, a lot of candles, both paraffin and soy, are corrupted with toxic dyes and fragrances; some soy candles are only partially soy with many other additives, and/or many commercial candles use GMO soy. The candles I use are non-GMO soy, which is clean burning without harmful fumes or soot, is grown in the U.S. and is both sustainable and renewable. They’re also completely free of dyes. The soy in these candles is not tested on animals, and is free of herbicides and pesticides. It’s also kosher, 100 percent natural and biodegradable. The fragrances are body safe, phthalate- and paraben-free, and contain no California prop 65 ingredients. You can search online for healthy candles, but if you like, you can use the ones I found at www.circleoflifefarms.com. I am not affiliated with the company and I earn no commissions on promoting their candles; I just thought you might benefit from using the ones I use in my home.

You may also like to try genuine Himalayan crystal salt lamps. The wavelengths of salt crystal colors fall within the upper nanometer zone (600-700 nanometers) producing orange/red light. Because of the neutral atomic structure of crystal salt, a heated salt lamp helps you balance artificial frequencies and neutralize electromagnetic radiation. (See: Why You Should Have a Himalayan Crystal Salt Lamp in Every Room of Your House.) — the Editor.

When it comes to computer screens, it is important to reduce the correlated color temperature down to 2,700 K — even during the day, not just at night. It’s even better to set it below 2,000K or even 1,000K. Many people use a program called F.lux to do this, but I have found a far better alternative that health and fitness author Ben Greenfield introduced to me, created by 22–year–old Bulgarian programmer Daniel Georgiev.

Daniel was using F.lux but became frustrated with the controls. He attempted to contact the F.lux programmers but they never got back to him, so he created a massively superior alternative called Iris. It is free, but you’ll want to pay the $2 and reward him with the donation. You can purchase the $2 Iris mini software here.

Iris is better because it has three levels of blue blocking below F.lux: dim incandescent, candle and ember. I have been using ember after sunset and measured the spectrum and it blocked nearly all light below 550 nm (which is spectacular) as you can see in the image below when I measured it on my monitor in the ember setting. When I measured the F.lux software at its lowest setting, incandescent, it showed loads of blue light coming through, as you can clearly see in the second image below.

So, if you are serious about protecting your vision, I’d recommend you switch to Iris. I have been using it for about three months now, and even though I have very good vision at the age of 62 and don’t require reading glasses, my visual acuity seems to have dramatically increased. I believe this is because I am not exposing my retina to the damaging effects of blue light after sunset.

More Information

Dr. Wunsch, who has studied photobiology and light therapy for decades, understands the influence of light on health perhaps better than anyone. Having this historical grounding will hopefully help you understand some of these benefits, and inspire you to apply heliotherapy in your own life. All you have to do is step outside and take some clothes off! There’s no question in my mind that sun exposure is as important — or nearly as important — as eating a healthy diet and exercising.

Unfortunately, virtually no one is talking about or teaching this. The point is, they did in the past. We’re now rediscovering what was common knowledge 100 years ago! Sadly, the pharmacological focus of modern medicine has created an enormous, manipulated bias, which essentially directs most of the research away from non-pharmaceutical medicine. If the focus of the medical establishment was authentically and sincerely motivated, based on specific healing principles, we would have expanded on the research into heliotherapy and photobiology. The reason we haven’t is because it’s been artificially suppressed. That’s the sad reality.

The good news is that this is the 21st century — a time when we have access to extremely powerful methods of communication, allowing us to share this information with literally millions of people. By doing so, we can create a foundation of a new understanding, thereby catalyzing research and therapeutic interventions that can help us avoid the expensive and toxic interventions typically recommended for diseases that respond perfectly well to interventions such as light.

It’s truly so simple. Take myopia for example. We’re now realizing that nearsightedness is closely linked to lack of sun exposure, especially during childhood — not a lack of vitamin D, mind you, but a lack of natural sunlight striking the eye. (If you missed my article on preventing myopia with sunlight, please take a moment to check it out now.) Understanding this connection, and doing something about it — sending your kids outdoors for at least an hour a day — could help prevent this extraordinarily common vision problem without costing a cent.

Born and raised in the inner city of Chicago, IL, Dr. Joseph Mercola is an osteopathic physician trained in both traditional and natural medicine. Board-certified in family medicine, Dr. Mercola served as the chairman of the family medicine department at St. Alexius Medical Center for five years, and in 2012 was granted fellowship status by the American College of Nutrition (ACN).While in practice in the late 80s, Dr. Mercola realized the drugs he was prescribing to chronically ill patients were not working. By the early 90s, he began exploring the world of natural medicine, and soon changed the way he practiced medicine.In 1997 Dr. Mercola founded Mercola.com, which is now routinely among the top 10 health sites on the internet. His passion is to transform the traditional medical paradigm in the United States. “The existing medical establishment is responsible for killing and permanently injuring millions of Americans… You want practical health solutions without the hype, and that’s what I offer.”Visit Mercola.com for more information, or read Dr. Mercola’s full bio and résumé here.Recommended articles by Dr. Joseph Mercola:

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